Bump actions/checkout from 5 to 6

Bumps [actions/checkout](https://github.com/actions/checkout) from 5 to 6.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v5...v6)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-version: '6'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

.github/workflows/release-debian.yml

@@ -23,7 +23,7 @@ jobs:
           apt-get -y upgrade
           apt-get -y install devscripts dpkg-dev debhelper equivs
       - name: Checkout repo
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
       - name: Bump version
         run: |
           export DEBEMAIL='maintainers@faucet.nz'

.github/workflows/release-python.yml

@@ -16,7 +16,7 @@ jobs:
       name: "release"
     steps:
       - name: Checkout repo
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
       - name: Set up python-${{ env.RELEASE_PY_VER }}
         uses: actions/setup-python@v6
         with:

.github/workflows/tests-codecheck.yml

@@ -11,7 +11,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout repo
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
       - name: Set up python-${{ env.CODECHECK_PY_VER }}
         uses: actions/setup-python@v6
         with:
@@ -31,7 +31,7 @@ jobs:
         python-version: [3.8, 3.9, '3.10']
     steps:
       - name: Checkout repo
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
       - name: Set up python-${{ env.CODECHECK_PY_VER }}
         uses: actions/setup-python@v6
         with:

.github/workflows/tests-unit.yml

@@ -14,7 +14,7 @@ jobs:
         python-version: [3.8, 3.9, '3.10', 3.11]
     steps:
       - name: Checkout repo
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
       - name: Set up python-${{ matrix.python-version }}
         uses: actions/setup-python@v6
         with:

.github/workflows/tests-yaml-lint.yml

@@ -4,7 +4,7 @@ jobs:
   yamllint:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
     - name: yaml-lint
       uses: ibiqlik/action-yamllint@v3
       with: